( disclosure: I am largely against the current intellectual property struct= ure. I don't want to argue about it. I want to find out what current prac= tice is ) =20 Definition: Prior art is all information that has been disclosed to the pub= lic in any form about an invention before a given date. Prior art includes = things like any patents related to your invention, any published articles a= bout your invention, and any public demonstrations. Patent law states "On taking up an application for examination or a patent = in a reexamination proceeding, the examiner shall make a thorough study the= reof and shall make a thorough investigation of the available prior art rel= ating to the subject matter of the claimed invention." This means that prio= r art could disqualify your application for a patent. According to Patentcafe prior art is "the total body of knowledge, which te= aches or otherwise relates directly to an invention. This is the primary cr= iteria in determining the patentability of a new invention. Establishes nov= elty and unobviousness of the art that relates to the invention in question= .. Prior art references include documentary sources such as patents and publ= ications from anywhere in the world, and nondocumentary sources such as thi= ngs known or used publicly. Is a site like http://www.halfbakery.com/ considered a source for prior art= ? Until the courts get involved..... is the USPTO the final referee concernin= g patents ? Gus --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .